CN107425747A - A kind of control method of inverter, system and inverter - Google Patents
A kind of control method of inverter, system and inverter Download PDFInfo
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- CN107425747A CN107425747A CN201710697548.XA CN201710697548A CN107425747A CN 107425747 A CN107425747 A CN 107425747A CN 201710697548 A CN201710697548 A CN 201710697548A CN 107425747 A CN107425747 A CN 107425747A
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- filter unit
- output voltage
- bus capacitor
- unit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/322—Means for rapidly discharging a capacitor of the converter for protecting electrical components or for preventing electrical shock
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/487—Neutral point clamped inverters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of control method of inverter, system and inverter, include obtaining the output voltage of the switching signal of dc switch, the switching signal of alternating-current switch and bus capacitor；Judge whether dc switch and alternating-current switch disconnect according to switching signal；If it is, judging whether the output voltage of bus capacitor is more than predetermined threshold value；If it is, control the turn-on and turn-off of switching tube in inversion unit so that inversion unit forms current loop with filter unit, to discharge the energy of bus capacitor until the output voltage of bus capacitor is less than predetermined threshold value.It can be seen that, the application is when judgement obtains dc switch and alternating-current switch disconnects, the turn-on and turn-off of switching tube in inversion unit can be controlled to realize that inversion unit forms current loop with filter unit, to discharge the energy of bus capacitor until the output voltage of bus capacitor is less than predetermined threshold value, high conversion efficiency, the discharge time of bus capacitor voltage is reduced, radiating is less and cost is low.
Description
Technical field
The present invention relates to electric and electronic technical field, more particularly to a kind of control method of inverter, system and inverse
Become device.
Background technology
With extensive use of the large-scale power electronic equipment in every profession and trade, the power grade and power of power electronic equipment
Density more and more higher, people require also more and more stricter to the safety of power electronic equipment.For inverter, to bus
Capacitance voltage is discharged, you can meets the safety requirement to inverter in safety standard.
Under normal circumstances, for inverter after being stopped, bus capacitor remains very high residual voltage, and these are remaining
Voltage typically at least needs the time of a few minutes just to discharge.In order to shorten bus capacitor discharge time, in the prior art generally
Busbar voltage is slowly discharged into safe voltage by the way of the discharge resistance of increase bus capacitor.But on the one hand, resistance
It is a kind of heater members for converting electrical energy into heat energy, is also at febrile state while electric discharge, if resistance heating is serious,
The radiating burden of inverter is not only increased, is also easy to security incident occur.On the other hand, the increase electric discharge electricity on bus
Resistance, also add the energy loss of inverter, reduce conversion efficiency, and with inverter power grade increasingly
Height, satisfactory discharge resistance are also fewer and fewer.In addition, it also add cost.
Therefore, how to provide a kind of scheme for solving above-mentioned technical problem is that those skilled in the art need solution to ask at present
Topic.
The content of the invention
It is an object of the invention to provide a kind of control method of inverter, system and inverter, is ensureing inversion dress
Put on the basis of higher conversion efficiency work, to reduce the discharge time of bus capacitor voltage, radiating is less and cost is low.
In order to solve the above technical problems, the invention provides a kind of control method of inverter, the inverter bag
The filter unit and alternating-current switch of the dc switch being sequentially connected, bus capacitor, inversion unit including electric capacity and inductance are included, should
Method includes：
Obtain the output of the switching signal of the dc switch, the switching signal of the alternating-current switch and the bus capacitor
Voltage；
Judge whether the dc switch and the alternating-current switch disconnect according to the switching signal；
If it is, judging whether the output voltage of the bus capacitor is more than predetermined threshold value；
If it is, control the turn-on and turn-off of switching tube in the inversion unit so that the inversion unit and the filter
Ripple unit forms current loop, to discharge the energy of the bus capacitor until the output voltage of the bus capacitor is less than default
Threshold value.
Preferably, this method also includes：
Obtain the output voltage and output current of the filter unit；
The turn-on and turn-off of switching tube in the control inversion unit so that the inversion unit and the filtering are single
Member formed current loop process be specially：
According to the output voltage set-point of the bus capacitor, the output voltage of the bus capacitor, the filter unit
Output voltage and output current control the modulation control unit by the way of closed-loop control, and then control the inversion list
The turn-on and turn-off of the switching tube of member so that the inversion unit forms current loop with the filter unit, with described in release
The energy of bus capacitor is until the output voltage of the bus capacitor is less than predetermined threshold value.
Preferably, it is described according to the output voltage set-point of the bus capacitor, the output voltage of the bus capacitor, institute
State the output voltage of filter unit and output current controls the modulation control unit by the way of closed-loop control, and then control
The process of the turn-on and turn-off of the switching tube of the inversion unit is specially：
The output voltage of the output voltage set-point and the bus capacitor of the bus capacitor is made the difference, obtains difference warp
Overvoltage ring obtains given value of current value；
The output voltage of the filter unit and output current are converted by CLARKE and PARK respectively, accordingly obtained
The output voltage and output current of filter unit under dq coordinate systems；
The given value of current value and the output current of the filter unit under the dq coordinate systems are made the difference, obtained difference warp
Overcurrent ring obtains the output voltage set-point of the filter unit under dq coordinate systems；
By the filter unit under the output voltage set-point of the filter unit under the dq coordinate systems and the dq coordinate systems
Output voltage correspond to be added respectively, the final voltage of filter unit under obtained dq coordinate systems, and by the filter unit
Final voltage converts to obtain the voltage of the filter unit under two-phase rest frame by anti-PARK；
It is described inverse to control that corresponding pwm signal is generated according to the voltage of the filter unit under the two-phase rest frame
Become the turn-on and turn-off of the switching tube of unit.
Preferably, the predetermined threshold value is 0.
In order to solve the above technical problems, present invention also offers a kind of control system of inverter, the inverter
Filter unit and alternating-current switch including the dc switch, bus capacitor, inversion unit including the electric capacity that are sequentially connected and inductance,
The system includes：
First switch signal acquiring unit, for obtaining the switching signal of the dc switch；
Second switch signal acquiring unit, for obtaining the switching signal of the alternating-current switch；
First voltage signal acquiring unit, for obtaining the output voltage of the bus capacitor；
First judging unit, for judging whether the dc switch and the alternating-current switch are equal according to the switching signal
Disconnect, if it is, the second judging unit of triggering；
Second judging unit, for judging whether the output voltage of the bus capacitor is more than predetermined threshold value, it is used for
Trigger control unit；
Described control unit, for controlling the turn-on and turn-off of switching tube in the inversion unit so that the inversion list
It is first to form current loop with the filter unit, to discharge the energy of the bus capacitor until the output electricity of the bus capacitor
Pressure is less than predetermined threshold value.
Preferably, the system also includes：
Second voltage signal acquiring unit, for obtaining the output voltage and output current of the filter unit；
The turn-on and turn-off of switching tube in the control inversion unit so that the inversion unit and the filtering are single
Member formed current loop process be specially：
According to the output voltage set-point of the bus capacitor, the output voltage of the bus capacitor, the filter unit
Output voltage and output current control the modulation control unit by the way of closed-loop control, and then control the inversion list
The turn-on and turn-off of the switching tube of member so that the inversion unit forms current loop with the filter unit, with described in release
The energy of bus capacitor is until the output voltage of the bus capacitor is less than predetermined threshold value.
Preferably, it is described according to the output voltage set-point of the bus capacitor, the output voltage of the bus capacitor, institute
State the output voltage of filter unit and output current controls the modulation control unit by the way of closed-loop control, and then control
The process of the turn-on and turn-off of the switching tube of the inversion unit is specially：
The output voltage of the output voltage set-point and the bus capacitor of the bus capacitor is made the difference, obtains difference warp
Overvoltage ring obtains given value of current value；
The output voltage of the filter unit and output current are converted by CLARKE and PARK respectively, accordingly obtained
The output voltage and output current of filter unit under dq coordinate systems；
The given value of current value and the output current of the filter unit under the dq coordinate systems are made the difference, obtained difference warp
Overcurrent ring obtains the output voltage set-point of the filter unit under dq coordinate systems；
By the filter unit under the output voltage set-point of the filter unit under the dq coordinate systems and the dq coordinate systems
Output voltage correspond to be added respectively, the final voltage of filter unit under obtained dq coordinate systems, and by the filter unit
Final voltage converts to obtain the voltage of the filter unit under two-phase rest frame by anti-PARK；
It is described inverse to control that corresponding pwm signal is generated according to the voltage of the filter unit under the two-phase rest frame
Become the turn-on and turn-off of the switching tube of unit.
Preferably, the predetermined threshold value is 0.
Preferably, the filter unit is LC filter units.
In order to solve the above technical problems, present invention also offers a kind of inverter, including be sequentially connected dc switch,
The filter unit and alternating-current switch of bus capacitor, inversion unit including electric capacity and inductance, in addition to inversion as described above dress
The control system put.
The invention provides a kind of control method of inverter, system and inverter, including obtain dc switch
The output voltage of switching signal, the switching signal of alternating-current switch and bus capacitor；Dc switch and friendship are judged according to switching signal
Whether stream switch disconnects；If it is, judging whether the output voltage of bus capacitor is more than predetermined threshold value；If it is, control is inverse
Become the turn-on and turn-off of switching tube in unit so that inversion unit forms current loop with filter unit, to discharge bus capacitor
Energy until the output voltage of bus capacitor is less than predetermined threshold value.
It can be seen that the application can be controlled in inversion unit and switched when judgement obtains dc switch and alternating-current switch disconnects
The turn-on and turn-off of pipe realize that inversion unit and filter unit form current loop, to discharge the energy of bus capacitor until female
The output voltage of line capacitance is less than predetermined threshold value, on the basis of ensureing inverter with higher conversion efficiency work, reduces
Discharge time of bus capacitor voltage, radiating is less and cost is low.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, below will be to institute in prior art and embodiment
The accompanying drawing needed to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the present invention
Example, for those of ordinary skill in the art, on the premise of not paying creative work, can also be obtained according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is a kind of flow chart of the process of the control method of inverter provided by the invention；
Fig. 2 is the control principle drawing for the inverter that a kind of filter unit provided by the invention is LC filter units；
Fig. 3 is the control principle drawing for the inverter that another filter unit provided by the invention is LC filter units；
Fig. 4 is the control principle drawing for the inverter that a kind of filter unit provided by the invention is LC mixed filtering units；
Fig. 5 is the control principle for the inverter that another filter unit provided by the invention is LC mixed filtering units
Figure；
Fig. 6 is a kind of control loop figure of inversion unit provided by the invention；
Fig. 7 is a kind of structural representation of the control system of inverter provided by the invention.
Embodiment
The core of the present invention is to provide a kind of inverter and its control method, is ensureing inverter with higher conversion
On the basis of efficiency work, the discharge time of bus capacitor voltage is reduced, radiating is less and cost is low.
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
It refer to Fig. 1, Fig. 1 is a kind of flow chart of the process of the control method of inverter provided by the invention, inversion
Device includes the filter unit for dc switch, bus capacitor, inversion unit including electric capacity and the inductance being sequentially connected and exchanged out
Close, this method includes：
Step 11：Obtain the output voltage of the switching signal of dc switch, the switching signal of alternating-current switch and bus capacitor；
Step 12：Judge whether dc switch and alternating-current switch disconnect according to switching signal, if it is, into step
13；
Step 13：Judge whether the output voltage of bus capacitor is more than predetermined threshold value, if it is, into step S14；
Step S14：Control the turn-on and turn-off of switching tube in inversion unit so that inversion unit forms electricity with filter unit
Road is flowed back to, to discharge the energy of bus capacitor until the output voltage of bus capacitor is less than predetermined threshold value.
Specifically, one of premise discharged the voltage of bus capacitor is that inversion unit is stopped, and the application is led to
Dc switch and alternating-current switch are crossed to judge whether inversion unit is stopped, wherein, dc switch is used to turn on or turn off
Bus capacitor and front stage circuits, alternating-current switch are used to turning on or turning off filter unit and late-class circuit.Specifically, when direct current is opened
When pass and alternating-current switch disconnect, then it is assumed that now inversion unit is stopped, and then judges the output voltage of bus capacitor again
Whether predetermined threshold value is more than, if it is, the output voltage of explanation bus capacitor now is larger, it is necessary to electricity to bus capacitor
Pressure is discharged.
Further, inversion is controlled after judging that the output voltage for obtaining bus capacitor is more than predetermined threshold value in the application
The turn-on and turn-off of switching tube in unit so that inversion unit forms current loop with filter unit, by the energy of bus capacitor
On the inductance and electric capacity for measuring the switching device consumed in inversion unit, filter unit.
For convenience of being the understanding of embodiment to the present invention, the present invention is described with two specific examples below：
When filter unit is LC filter units：
Fig. 2 and Fig. 3 are refer to, wherein, Fig. 2 is the inversion dress that a kind of filter unit provided by the invention is LC filter units
The control principle drawing put, Fig. 3 are that the control for the inverter that another filter unit provided by the invention is LC filter units is former
Reason figure.
First stage, the first switch pipe Q1 in inversion unit and the 4th switching tube Q4 conductings are controlled, controls inversion unit
In second switch pipe Q2 and the 3rd switching tube Q3 shut-offs, now bus capacitor anode-first switch pipe Q1-inductance L-electricity
Hold the switching tubes of C-the 4th Q4-bus capacitor negative terminal and form current loop, the energy expenditure of bus capacitor first switch pipe Q1,
On inductance L, electric capacity C and the 4th switching tube Q4.
Second stage, the second switch pipe Q2 in inversion unit and the 3rd switching tube Q3 conductings are controlled, controls inversion unit
In first switch pipe Q1 and the 4th switching tube Q4 shut-offs, the now switching tube of bus capacitor anode-the 3rd Q3-electric capacity C-electricity
Feel L-second switch pipe Q2-bus capacitor negative terminal and form current loop, the energy expenditure of bus capacitor second switch pipe Q2,
On inductance L, electric capacity C and the 3rd switching tube Q3.
Control inversion unit arrives second stage and switched repeatedly in the first stage, until the output voltage of bus capacitor is less than in advance
If threshold value.
When filter unit is LC mixed filtering units：
First stage, the first switch pipe Q1 conductings in inversion unit are controlled, control the switches of the 7th switching tube Q7 and the 8th
Pipe Q8 or the 11st switching tube Q11 of control and the 12nd switching tube Q12 conductings (refer to Fig. 4, Fig. 4 is provided by the invention
A kind of filter unit is the control principle drawing of the inverter of LC mixed filtering units)；
Second stage, the 5th switching tube Q5 conductings in inversion unit are controlled, control the switches of the 3rd switching tube Q3 and the 4th
Pipe Q4 is turned on or the 11st switching tube Q11 of control and the 12nd switching tube Q12 conductings；
Phase III, control the 9th switching tube Q9 of inversion unit to turn on, control the 3rd switching tube Q3 and the 4th switching tube
Q4 is turned on or the 7th switching tube Q7 of control and the 8th switching tube Q8 conductings；
Fourth stage, control the second switch pipe Q2 of inversion unit to turn on, control the 8th switching tube Q8 or control the tenth
Two switching tube Q12 conductings (refer to Fig. 5, Fig. 5 is that another filter unit provided by the invention is the inverse of LC mixed filtering units
Become the control principle drawing of device)；
In 5th stage, the 6th switching tube Q6 of inversion unit is controlled to turn on, control the 4th switching tube Q4 or the 12nd is opened
Close pipe Q12 conductings；
In 6th stage, control the 9th switching tube Q9 of inversion unit to turn on, control the 4th switching tube Q4 or control the 8th
Switching tube Q8 is turned on；
In 7th stage, control the 4th switching tube Q4 of inversion unit to turn on, control the 5th switching tube Q5 and the 6th switching tube
Q6 or the 9th switching tube Q9 of control and the tenth switching tube Q10 conductings；
In 8th stage, control the 8th switching tube Q8 of inversion unit to turn on, control first switch pipe Q1 and second switch pipe
Q2 or the 11st switching tube Q11 of control and the 12nd switching tube Q12 conductings；
In 9th stage, control the 12nd switching tube Q12 of inversion unit to turn on, control first switch pipe Q1 and second switch
Pipe Q2 or the 9th switching tube Q9 of control and the tenth switching tube Q10 conductings；
In tenth stage, control the 3rd switching tube Q3 of inversion unit to turn on, control the switches of the 5th switching tube Q5 or the 9th
Pipe Q9 is turned on；
In 11st stage, the 7th switching tube Q7 of inversion unit is controlled to turn on, control first switch pipe Q1 or the 9th is opened
Close pipe Q9 conductings；
Tenth two-stage, the 11st switching tube Q11 conductings of modulation control unit control inversion unit, control first switch
Pipe Q1 or the 5th switching tube Q5 conductings.
Control inversion unit is switched over to the tenth two-stage in the first stage so that inversion unit is formed with filter unit
Current loop, by the energy expenditure of bus capacitor switching tube, filter unit inductance and electric capacity on.
To sum up：
1st, solve the problems, such as that bus capacitor discharge time is long in the prior art；
2nd, due to no increase discharge resistance, inverter will not be made additionally to produce power damage, ensures to turn with higher
Efficiency is changed to be operated；
3rd, due to no increase discharge resistance, the heat releasing source of inverter will not be increased, to the requirement of complete machine heat dissipation design compared with
It is low；
4th, due to no increase discharge resistance, equipment cost will not be increased.
The invention provides a kind of control method of inverter, system and inverter, including obtain dc switch
The output voltage of switching signal, the switching signal of alternating-current switch and bus capacitor；Dc switch and friendship are judged according to switching signal
Whether stream switch disconnects；If it is, judging whether the output voltage of bus capacitor is more than predetermined threshold value；If it is, control is inverse
Become the turn-on and turn-off of switching tube in unit so that inversion unit forms current loop with filter unit, to discharge bus capacitor
Energy until the output voltage of bus capacitor is less than predetermined threshold value.
It can be seen that the application can be controlled in inversion unit and switched when judgement obtains dc switch and alternating-current switch disconnects
The turn-on and turn-off of pipe realize that inversion unit and filter unit form current loop, to discharge the energy of bus capacitor until female
The output voltage of line capacitance is less than predetermined threshold value, on the basis of ensureing inverter with higher conversion efficiency work, reduces
Discharge time of bus capacitor voltage, radiating is less and cost is low.
On the basis of above-described embodiment：
As a kind of preferred embodiment, this method also includes：
Obtain the output voltage and output current of filter unit；
Control the turn-on and turn-off of switching tube in inversion unit so that inversion unit forms current loop with filter unit
Process is specially：
According to the output voltage set-point of bus capacitor, the output voltage of bus capacitor, filter unit output voltage and
Output current controls modulation control unit by the way of closed-loop control, and then controls conducting and the pass of the switching tube of inversion unit
It is disconnected so that inversion unit forms current loop with filter unit, to discharge the energy of bus capacitor until the output of bus capacitor
Voltage is less than predetermined threshold value.
Specifically, the application causes the output voltage of bus capacitor to be less than predetermined threshold value using closed-loop control, has essence
The advantages of degree is high, strong interference immunity.Certainly, other control modes can also be used here, and the application does not do special limit herein
It is fixed, determined according to actual conditions.
As a kind of preferred embodiment, according to the output voltage set-point of bus capacitor, bus capacitor output voltage,
The output voltage and output current of filter unit control modulation control unit by the way of closed-loop control, and then control inversion list
The process of turn-on and turn-off of the switching tube of member is specially：
The output voltage of the output voltage set-point of bus capacitor and bus capacitor is made the difference, difference is obtained and passes through Voltage loop
Obtain given value of current value；
The output voltage of filter unit and output current are converted by CLARKE and PARK respectively, accordingly obtain dq seats
The output voltage and output current of filter unit under mark system；
Given value of current value and the output current of the filter unit under dq coordinate systems are made the difference, obtained difference passes through electric current loop
Obtain the output voltage set-point of the filter unit under dq coordinate systems；
By the output electricity of the filter unit under the output voltage set-point and dq coordinate systems of the filter unit under dq coordinate systems
Pressure is corresponded to be added respectively, the final voltage of filter unit under obtained dq coordinate systems, and the final voltage of filter unit is passed through
Anti- PARK converts to obtain the voltage of the filter unit under two-phase rest frame；
Corresponding pwm signal is generated according to the voltage of the filter unit under two-phase rest frame to control inversion unit
The turn-on and turn-off of switching tube.
Specifically, in order to further improve control accuracy, the application is using the control method of voltage and current double closed-loop come real
Existing closed-loop control, specifically, Fig. 6 is refer to, Fig. 6 is a kind of control loop figure of inversion unit provided by the invention.
Output voltage set-point Vdc-refOutput voltage V with sampling obtained bus capacitordcClosed-loop control is carried out, is passed through
Voltage loop Gv (s) obtains given value of current value Id-refAnd Iq-ref, given value of current value Id-refAnd Iq-refWith the output current of filter unit
IdAnd IqClosed-loop control is carried out, closed-loop control is reached by electric current loop Gi (s).
Wherein, Id、Iq, filter unit output voltage edAnd eqThe output current of the filter unit obtained respectively by sampling
Convert to obtain by CLARKE and PARK with output current, wherein：
CLARK：
PARK：
Wherein, θ is line voltage Ua phase angle.
As a kind of preferred embodiment, predetermined threshold value 0.
In order to ensure the security performance of inversion unit and whole inverter, predetermined threshold value here could be arranged to 0, when
So, predetermined threshold value here may be arranged as other numerical value, and the application is not particularly limited herein, according to actual conditions come
It is fixed.
Fig. 7 is refer to, Fig. 7 is a kind of structural representation of the control system of inverter provided by the invention, and inversion fills
Put the filter unit including dc switch, bus capacitor, inversion unit including the electric capacity being sequentially connected and inductance and exchange out
Close, the system includes：
First switch signal acquiring unit 1, for obtaining the switching signal of dc switch；
Second switch signal acquiring unit 2, for obtaining the switching signal of alternating-current switch；
First voltage signal acquiring unit 3, for obtaining the output voltage of bus capacitor；
First judging unit 4, for judging whether dc switch and alternating-current switch disconnect according to switching signal, if
It is to trigger the second judging unit；
Second judging unit 5, for judging whether the output voltage of bus capacitor is more than predetermined threshold value, controlled for triggering
Unit；
Control unit 6, for controlling the turn-on and turn-off of switching tube in inversion unit so that inversion unit and filter unit
Current loop is formed, to discharge the energy of bus capacitor until the output voltage of bus capacitor is less than predetermined threshold value.
As a kind of preferred embodiment, the system also includes：
Second voltage signal acquiring unit, for obtaining the output voltage and output current of filter unit；
Control the turn-on and turn-off of switching tube in inversion unit so that inversion unit forms current loop with filter unit
Process is specially：
According to the output voltage set-point of bus capacitor, the output voltage of bus capacitor, filter unit output voltage and
Output current controls modulation control unit by the way of closed-loop control, and then controls conducting and the pass of the switching tube of inversion unit
It is disconnected so that inversion unit forms current loop with filter unit, to discharge the energy of bus capacitor until the output of bus capacitor
Voltage is less than predetermined threshold value.
As a kind of preferred embodiment, according to the output voltage set-point of bus capacitor, bus capacitor output voltage,
The output voltage and output current of filter unit control modulation control unit by the way of closed-loop control, and then control inversion list
The process of turn-on and turn-off of the switching tube of member is specially：
The output voltage of the output voltage set-point of bus capacitor and bus capacitor is made the difference, difference is obtained and passes through Voltage loop
Obtain given value of current value；
The output voltage of filter unit and output current are converted by CLARKE and PARK respectively, accordingly obtain dq seats
The output voltage and output current of filter unit under mark system；
Given value of current value and the output current of the filter unit under dq coordinate systems are made the difference, obtained difference passes through electric current loop
Obtain the output voltage set-point of the filter unit under dq coordinate systems；
By the output electricity of the filter unit under the output voltage set-point and dq coordinate systems of the filter unit under dq coordinate systems
Pressure is corresponded to be added respectively, the final voltage of filter unit under obtained dq coordinate systems, and the final voltage of filter unit is passed through
Anti- PARK converts to obtain the voltage of the filter unit under two-phase rest frame；
Corresponding pwm signal is generated according to the voltage of the filter unit under two-phase rest frame to control inversion unit
The turn-on and turn-off of switching tube.
As a kind of preferred embodiment, predetermined threshold value 0.
As a kind of preferred embodiment, filter unit is LC filter units.
Certainly, LC filter units here can also be other kinds of filter unit, and the application is not done particularly herein
Limit, determined according to actual conditions.
Above-described embodiment is refer to for a kind of introduction of the control system of inverter provided by the invention, the present invention exists
This is repeated no more.
In order to solve the above technical problems, present invention also offers a kind of inverter, including be sequentially connected dc switch,
The filter unit and alternating-current switch of bus capacitor, inversion unit including electric capacity and inductance, in addition to inverter described above
Control system.
Above-described embodiment is refer to for a kind of introduction of inverter provided by the invention, the present invention is no longer superfluous herein
State.
It should be noted that in this manual, such as first and second or the like relational terms are used merely to one
Individual entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operate it
Between any this actual relation or order be present.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Cover including for nonexcludability, so that process, method, article or equipment including a series of elements not only include those
Key element, but also the other element including being not expressly set out, or also include for this process, method, article or set
Standby intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Other identical element in the process including the key element, method, article or equipment also be present.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (10)
1. a kind of control method of inverter, the inverter includes the dc switch, bus capacitor, inversion being sequentially connected
Unit includes the filter unit and alternating-current switch of electric capacity and inductance, it is characterised in that this method includes：
Obtain the output electricity of the switching signal of the dc switch, the switching signal of the alternating-current switch and the bus capacitor
Pressure；
Judge whether the dc switch and the alternating-current switch disconnect according to the switching signal；
If it is, judging whether the output voltage of the bus capacitor is more than predetermined threshold value；
If it is, control the turn-on and turn-off of switching tube in the inversion unit so that the inversion unit and the filtering are single
Member forms current loop, to discharge the energy of the bus capacitor until the output voltage of the bus capacitor is less than default threshold
Value.
2. the control method of inverter as claimed in claim 1, it is characterised in that this method also includes：
Obtain the output voltage and output current of the filter unit；
The turn-on and turn-off of switching tube in the control inversion unit so that the inversion unit and the filter unit shape
Process into current loop is specially：
According to the output voltage set-point of the bus capacitor, the output voltage of the bus capacitor, the filter unit it is defeated
Go out voltage and output current and the modulation control unit is controlled by the way of closed-loop control, and then control the inversion unit
The turn-on and turn-off of switching tube so that the inversion unit forms current loop with the filter unit, to discharge the bus
The energy of electric capacity is until the output voltage of the bus capacitor is less than predetermined threshold value.
3. the control method of inverter as claimed in claim 2, it is characterised in that described according to the defeated of the bus capacitor
Go out voltage set-point, the output voltage of the bus capacitor, the output voltage of the filter unit and output current and use closed loop
The mode of control controls the modulation control unit, and then controls the process of the turn-on and turn-off of the switching tube of the inversion unit
Specially：
The output voltage of the output voltage set-point and the bus capacitor of the bus capacitor is made the difference, obtains difference by electricity
Pressure ring obtains given value of current value；
The output voltage of the filter unit and output current are converted by CLARKE and PARK respectively, accordingly obtain dq seats
The output voltage and output current of filter unit under mark system；
The given value of current value and the output current of the filter unit under the dq coordinate systems are made the difference, obtained difference is by electricity
Stream ring obtains the output voltage set-point of the filter unit under dq coordinate systems；
By the defeated of the filter unit under the output voltage set-point of the filter unit under the dq coordinate systems and the dq coordinate systems
Go out voltage and correspond to respectively to be added, the final voltage of filter unit under obtained dq coordinate systems, and by the final of the filter unit
Voltage converts to obtain the voltage of the filter unit under two-phase rest frame by anti-PARK；
Corresponding pwm signal is generated according to the voltage of the filter unit under the two-phase rest frame to control the inversion list
The turn-on and turn-off of the switching tube of member.
4. the control method of the inverter as described in claim any one of 1-3, it is characterised in that the predetermined threshold value is 0.
5. a kind of control system of inverter, the inverter includes the dc switch, bus capacitor, inversion being sequentially connected
Unit includes the filter unit and alternating-current switch of electric capacity and inductance, it is characterised in that the system includes：
First switch signal acquiring unit, for obtaining the switching signal of the dc switch；
Second switch signal acquiring unit, for obtaining the switching signal of the alternating-current switch；
First voltage signal acquiring unit, for obtaining the output voltage of the bus capacitor；
First judging unit, for judging whether the dc switch and the alternating-current switch are disconnected according to the switching signal
Open, if it is, the second judging unit of triggering；
Second judging unit, for judging whether the output voltage of the bus capacitor is more than predetermined threshold value, for triggering
Control unit；
Described control unit, for controlling the turn-on and turn-off of switching tube in the inversion unit so that the inversion unit with
The filter unit forms current loop, to discharge the energy of the bus capacitor until the output voltage of the bus capacitor is small
In predetermined threshold value.
6. the control system of inverter as claimed in claim 5, it is characterised in that the system also includes：
Second voltage signal acquiring unit, for obtaining the output voltage and output current of the filter unit；
The turn-on and turn-off of switching tube in the control inversion unit so that the inversion unit and the filter unit shape
Process into current loop is specially：
According to the output voltage set-point of the bus capacitor, the output voltage of the bus capacitor, the filter unit it is defeated
Go out voltage and output current and the modulation control unit is controlled by the way of closed-loop control, and then control the inversion unit
The turn-on and turn-off of switching tube so that the inversion unit forms current loop with the filter unit, to discharge the bus
The energy of electric capacity is until the output voltage of the bus capacitor is less than predetermined threshold value.
7. the control system of inverter as claimed in claim 6, it is characterised in that described according to the defeated of the bus capacitor
Go out voltage set-point, the output voltage of the bus capacitor, the output voltage of the filter unit and output current and use closed loop
The mode of control controls the modulation control unit, and then controls the process of the turn-on and turn-off of the switching tube of the inversion unit
Specially：
The output voltage of the output voltage set-point and the bus capacitor of the bus capacitor is made the difference, obtains difference by electricity
Pressure ring obtains given value of current value；
The output voltage of the filter unit and output current are converted by CLARKE and PARK respectively, accordingly obtain dq seats
The output voltage and output current of filter unit under mark system；
The given value of current value and the output current of the filter unit under the dq coordinate systems are made the difference, obtained difference is by electricity
Stream ring obtains the output voltage set-point of the filter unit under dq coordinate systems；
By the defeated of the filter unit under the output voltage set-point of the filter unit under the dq coordinate systems and the dq coordinate systems
Go out voltage and correspond to respectively to be added, the final voltage of filter unit under obtained dq coordinate systems, and by the final of the filter unit
Voltage converts to obtain the voltage of the filter unit under two-phase rest frame by anti-PARK；
Corresponding pwm signal is generated according to the voltage of the filter unit under the two-phase rest frame to control the inversion list
The turn-on and turn-off of the switching tube of member.
8. the control method of the inverter as described in claim any one of 5-7, it is characterised in that the predetermined threshold value is 0.
9. the control system of inverter as claimed in claim 8, it is characterised in that the filter unit is that LC filtering is single
Member.
10. a kind of inverter, including the dc switch, bus capacitor, inversion unit including the electric capacity that are sequentially connected and inductance
Filter unit and alternating-current switch, it is characterised in that also include the control system of the inverter as described in claim any one of 5-9
System.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710697548.XA CN107425747A (en) | 2017-08-15 | 2017-08-15 | A kind of control method of inverter, system and inverter |
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| CN201710697548.XA CN107425747A (en) | 2017-08-15 | 2017-08-15 | A kind of control method of inverter, system and inverter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113193665A (en) * | 2020-01-13 | 2021-07-30 | 北京新能源汽车股份有限公司 | Wireless charging system and control method |
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Address after: 361000 Ma Long Road 457, Torch Garden, Xiamen Torch High-tech Zone, Fujian Province Applicant after: Kehua Hengsheng Co., Ltd. Applicant after: Kehua Technology Co., Ltd., Zhangzhou Address before: 361000 torch garden, torch high tech Zone, Xiamen, Fujian 457 Applicant before: Xiamen Kehua Hengsheng Co., Ltd. Applicant before: Kehua Technology Co., Ltd., Zhangzhou |
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Application publication date: 20171201 |